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Temperature Unit Converter

Convert between Celsius (°C), Fahrenheit (°F), Kelvin (K), and Rankine (°R) scales.

Temperature Converter — interactive calculator, computed instantly in your browser.

📚 Authoritative Educational Guide

The Physics of Temperature Scales: Celsius, Fahrenheit & Kelvin

🌡️ Thermal Benchmarks

Key Physical Thermal Milestones Across Scales

Absolute Zero 0 K | -273.15°C | -459.67°F Water Freezing 273.15 K | 0°C | 32°F Water Boiling 373.15 K | 100°C | 212°F

Key Takeaway: While Celsius and Fahrenheit set reference points based on water properties, Kelvin is an absolute thermodynamic scale rooted in zero molecular kinetic energy.

Temperature is a fundamental physical quantity that measures the average kinetic energy of the vibrating molecules within a substance. Throughout scientific history, different scales have been engineered for meteorological, domestic, and thermodynamic applications.

1. Exact Conversion Equations

  • Celsius to Fahrenheit: $^{\circ}\text{F} = (^{\circ}\text{C} \times 9/5) + 32$
  • Fahrenheit to Celsius: $^{\circ}\text{C} = (^{\circ}\text{F} - 32) \times 5/9$
  • Celsius to Kelvin: $\text{K} = ^{\circ}\text{C} + 273.15$
  • Kelvin to Celsius: $^{\circ}\text{C} = \text{K} - 273.15$

2. Universal Thermal Benchmarks Reference Table

Physical State Celsius (°C) Fahrenheit (°F) Kelvin (K)
Absolute Zero -273.15 °C -459.67 °F 0.00 K
Water Freezes 0.00 °C 32.00 °F 273.15 K
Human Body Temp 37.00 °C 98.60 °F 310.15 K
Water Boils (Sea Level) 100.00 °C 212.00 °F 373.15 K

🔗 Thermal & Physical Conversion Tools

Thermodynamic conversions require precise linear equations. Visit our comprehensive 🔄 Unit Conversions Hub to translate between international metric and imperial standards.

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Frequently Asked Questions (Temperature Converter)

At what temperature are Celsius and Fahrenheit equal?

Celsius and Fahrenheit are identical at exactly -40° (-40°C = -40°F). You can verify this algebraically: (-40 × 9/5) + 32 = -72 + 32 = -40.

Why does the Kelvin scale not use a degree symbol (°) ?

Kelvin is an absolute SI unit of thermodynamic temperature, not an arbitrary relative scale. Therefore, it is written simply as K (e.g., 300 K, not 300°K).

What is the Rankine temperature scale?

Rankine (°R) is the absolute thermodynamic equivalent of the Fahrenheit scale, where 0 °R equals absolute zero and water freezes at 491.67 °R.